executing market orders

[yossarian78]

hi everyone,
i've finally finished setting up my hft bot for micro-transactions on the bitcoin market, currently doing some small scale trading on huobi and okcoin.

trying to figure out what is the best way to perform an exact market buy order (for example "buy 0.1 BTC on market price")
i'm using buy price from the exchange ticker to detremine my order price and so far about 1 out of 5 of my orders only bus me 0.099 btc...
any insights or best practices to make a perefectly round purchase of bitcoins?

[Fabrizio89]

Are you playing on the spreads or did you set a strategy too?